Vlv2TbltDevicePkg: Update PlatformPkgGccX64.dsc

Vlv2TbltDevicePkg: Update PlatformPkgGccX64.dsc

Update PlatformPkgGccX64.dsc to align with PlatformPkgX64.dsc
on library mappings and PCD settings.

Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: David Wei <david.wei@intel.com>
Cc: Mang Guo <mang.guo@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Michael Kinney <michael.d.kinney@intel.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>